在Note信息中可以看到sql profile的信息, - SQL profile PROF_4hpk08j31nm7y_1404472509 used for this statement,说明已经强制使用了手工绑定的执行计划,之后这个语句就一直采用全表扫描了,不会再走索引的访问方式 FORCE_MATCH=>TRUE :如果sql语句中既有绑定变量和字面值传入还是无法当做同一条语句处理;只能是全部...
Enter value for child_no2(used to generate sql_hints) (0): Enter value for profile_name (PROF_sqlid_planhash):PROF_1 Enter value for category (DEFAULT): Enter value for force_matching (FALSE):TRUE old 9: decode('&&profile_name','X0X0X0X0','PROF_&&sql_id1'||'_'||plan_hash_valu...
从force_matching_signature 的特性,我们可以想到一个用途,用于查找没有使用绑定变量的 SQL 语句,类似于使用 plan_hash_value 来查找。 回到前面,accept_sql_profile 这个过程,force_match 参数设为 TRUE,那么 dba_sql_profiles 中的 signature 则是由 SQL 的 force_matching_signature 而来,否则便是 exact_matching...
SQL>REM SQL Profile for SQL_ID 9bf751pc4r9c9 based on plan hash SQL>REM value 1494048713. SQL>REM The custom SQL Profile to be created by this script SQL>REM will affect plans for SQL commands with signature SQL>REM matching the one for SQL Text below. SQL>REM Review SQL Text and a...
execute dbms_sqltune.accept_sql_profile(task_name => 'TASK_231',task_owner => 'SYS', replace => TRUE); 1. 以上,绑定工作就完成了。 查看新生成的sql profile: select name,SIGNATURE,type,category,status,force_matching from dba_sql_profiles; ...
当运行很久的Job突然出现性能问题时,并排除数据量突然变大,可能原因有执行的脚本的某些对应的SQL的解析计划变更,在Oracle 10g中可以通过绑定profile,在11g中可以通过baseline进行绑定 2. 解决步骤 Step1. 通过对应的User或者其他信息查找Session ID Step2. 通过Session_ID查看该SQL_ID历史的解析计划变换 ...
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If the performance improvement improves at least threefold, then the database accepts the SQL profile, but only if the ACCEPT_SQL_PROFILES task parameter is set to TRUE. Otherwise, the automatic SQL tuning reports merely report the recommendation to create a SQL profile. Optionally, implements ...
当在包含视图的查询中使用 FORCE ORDER 提示时,视图中表的联接顺序将由有序构造中视图的位置决定。 例如,下面的查询将从三个表和一个视图中进行选择:SQL 复制 SELECT * FROM Table1, Table2, View1, Table3 WHERE Table1.Col1 = Table2.Col1 AND Table2.Col1 = View1.Col1 AND View1.Col2 = ...
Table hints other than INDEX, FORCESCAN, and FORCESEEK are disallowed as query hints unless the query already has a WITH clause specifying the table hint. In this case, a matching hint must also be specified as a query hint. Specify the matching hint as a query hint by using ...